US3784493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aminolignosulfonate-formaldehyde reaction products and process of preparation
Assignee: Dryden Chem Ltd
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Filing: 1971-10-04
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Granted: 1974-01-08
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Expires: 1991-10-04
Abstract
Abstract THE INVENTION RELATES TO THE TREATMENT OF SPENT SULFITE LIQUOR BY CHANGING THE BASE METAL LIGNOSULFONATES THEREIN TO AMINE LIGNOSULFONATES WHICH ARE THEN REACTED WITH FORMALDEHYDE TO PRODUCE PRODUCTS WHICH ARE USEFUL, FOR INSTANCE, AS SETTING CONTROL AGENTS IN CEMENT, AS HYDRATION SHALE INHIBITORS, AND AS FILLERS IN THE FORMMATION OF RESINS.
Inventors
- 👤 J Giguere
- 👤 J Landry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:43
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |